For an explanation, see the main splats page
- Fish make a natural group of animals, because they have similar methods of reproduction and breathing, and structures such as gills, fins and scales.
- Like the reptiles and the amphibians, the fish are poikilothermic or cold-blooded, and this can bring special problems for fish in polar waters.
- Fish are found in both fresh and salt waters all over the world, though some fish can survive out of water for a short while, enough to move from pool to pool.
- Some of the early fish developed their fins into something not unlike legs, and moved onto the shore, giving rise to the earliest four-legged amphibians.
- Bony fish show a wide variety of adaptations in their structures and behaviour. Some fish also show a limited ability to learn from their experiences.
- Bony fish are generally able to adjust their buoyancy, in much the same way that submarines do by adding or removing gases from a swim bladder.
- Sharks and rays have cartilage for their skeletons and no bone, and they have a number of other common characteristics, like the lack of a swim bladder.
- Sharks have heterocercal tails which produce lift as they swim. This, with the angling of their pectoral fins, keeps the negative buoyancy sharks from sinking.
- Some sharks reproduce in unexpected ways, some of them nurturing eggs within their body and actually producing live young, while others lay eggs.
- Fish rely on a variety of senses, including sound (vibration detection), smell (taste), sight, and electric senses which are effective in muddy water.
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